Slider menu with mc inside wont preload

hey all,
I am using a slider navigation with the following code
stop();
//function that makes the movie move
//move () makes it move smoothly, move2 () makes it move with an elastic effect
MovieClip.prototype.move2 = function () {
dest = _root.xnew ;
pos = this._x ;
vel = vel*0.7 + (dest-pos)/7 ;
this._x += vel ;
}
MovieClip.prototype.move = function () {
dest = _root.xnew ;
pos = this._x ;
vel = (dest-pos)/7 ;
this._x += vel ;
}

I then have MC’s inside the big movie clip (general). I would like to preload these MC’s when the user clicks on each item (see solidhang.com/tonytemp/homepage.html --> click on INSTALLATION --> click on video --> click on big box with image in it) The movie will load in that box. However it doesn’t preload, and hence the viewer is confused as to whether it is a still image or a movie clip that is loading

any help would be great
cheers
P